TeslaUnread provides unread count badges for Nova Launcher Prime and WidgetLocker. It will not work with other desktops or lockscreens.
Requirements: Varies with device
Unread counts are natively supported for the most popular chat and email apps, such as Hangouts, Whatsapp and all the apps shown in the screenshot.
Additionally on Android 4.3+ TeslaUnread can watch the notification bar to extract unread counts from virtually any app.
Enable TeslaUnread in Nova Launcher or WidgetLocker Settings > Unread Counts, here you may also customize the style of the badge, such as the size and colors.
5.0 Feb 23, 2016 (Staged roll out)
Simplified user interface
Improved handling of unread counts from notifications
Improved or added support for several more apps
Added crash and usage analytics (and internet permission) to help identify issues and further improve TeslaUnread
5.0.4 March 14
Update to handle Outlook v2.0.52
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